本文实例为大家分享了java使用poi导出Excel的具体代码，供大家参考，具体内容如下

package hyss.util.common;import java.io.IOException;import java.io.OutputStream;import java.net.URLEncoder;import java.util.ArrayList;import java.util.List;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFCellStyle;import org.apache.poi.hssf.usermodel.HSSFFont;import org.apache.poi.hssf.usermodel.HSSFRichTextString;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.hssf.util.HSSFColor;import org.apache.poi.ss.util.CellRangeAddress;/** * Excel导出工具类 * @author ts */public class ExportExcelUtil { //显示的导出表的标题 private String title; //导出表的列名 private String[] rowName ; private List<Object[]> dataList = new ArrayList<Object[]>(); // HttpServletResponse response; //构造方法，传入要导出的数据 public ExportExcelUtil(String title,String[] rowName,List<Object[]> dataList){ this.dataList = dataList; this.rowName = rowName; this.title = title; } /* * 导出数据 * */ public void export() throws Exception{ try{ HSSFWorkbook workbook = new HSSFWorkbook(); // 创建工作簿对象 HSSFSheet sheet = workbook.createSheet(title); // 创建工作表 // 产生表格标题行 HSSFRow rowm = sheet.createRow(0); HSSFCell cellTiltle = rowm.createCell(0); rowm.setHeightInPoints(25); //设置标题行默认行高 //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面 - 可扩展】 HSSFCellStyle columnTitleStyle = this.getTitleTopStyle(workbook);//获取标题行样式 HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook); //获取列头样式对象 HSSFCellStyle style = this.getStyle(workbook); //单元格样式对象 sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1))); cellTiltle.setCellStyle(columnTitleStyle); cellTiltle.setCellValue(title); // 定义所需列数 int columnNum = rowName.length; HSSFRow rowRowName = sheet.createRow(2); // 在索引2的位置创建行(最顶端的行开始的第二行) rowRowName.setHeightInPoints(25); //将列头设置默认行高 // 将列头设置到sheet的单元格中 for(int n=0;n<columnNum;n++){ HSSFCell cellRowName = rowRowName.createCell(n); //创建列头对应个数的单元格 cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); //设置列头单元格的数据类型 HSSFRichTextString text = new HSSFRichTextString(rowName[n]); cellRowName.setCellValue(text); //设置列头单元格的值 cellRowName.setCellStyle(columnTopStyle); //设置列头单元格样式 } //将查询出的数据设置到sheet对应的单元格中 for(int i=0;i<dataList.size();i++){ Object[] obj = dataList.get(i);//遍历每个对象 HSSFRow row = sheet.createRow(i+3);//创建所需的行数 row.setHeightInPoints(20); //将创建出的行设置默认行高 for(int j=0; j<obj.length; j++){ HSSFCell cell = null; //设置单元格的数据类型 if(j == 0){ cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC); cell.setCellValue(i+1); }else{ cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING); if(!"".equals(obj[j]) && obj[j] != null){ cell.setCellValue(obj[j].toString()); //设置单元格的值 } } cell.setCellStyle(style); //设置单元格样式 } } //让列宽随着导出的列长自动适应 for (int colNum = 0; colNum < columnNum; colNum++) { int columnWidth = sheet.getColumnWidth(colNum) / 256; for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) { HSSFRow currentRow; //当前行未被使用过 if (sheet.getRow(rowNum) == null) { currentRow = sheet.createRow(rowNum); } else { currentRow = sheet.getRow(rowNum); } if (currentRow.getCell(colNum) != null) { HSSFCell currentCell = currentRow.getCell(colNum); if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) { int length = currentCell.getStringCellValue().getBytes().length; if (columnWidth < length) { columnWidth = length; } } } } if(colNum == 0){ sheet.setColumnWidth(colNum, (columnWidth-2) * 256); }else{ sheet.setColumnWidth(colNum, (columnWidth+4) * 256); } } if(workbook !=null){ try { String fileName = title + DateTime.getSystemDateTime("yyyy-MM-dd") + ".xls";　　　　　　　　　　　　　//因 response已经封装成工具类所以下面这段代码注释掉// response =ServletActionContext.getResponse();// response.setContentType("APPLICATION/OCTET-STREAM");// response.setHeader("Content-Disposition", headStr);// OutputStream out = response.getOutputStream(); //解决中文乱码 Struts2Util.getResponse().setCharacterEncoding("UTF-8"); //解决中文乱码 Struts2Util.getResponse().setHeader("Content-Disposition", "attachment;filename*=UTF-8''" + URLEncoder.encode(fileName,"UTF-8")); //文件下载 Struts2Util.getResponse().setContentType("APPLICATION/OCTET-STREAM"); OutputStream out = Struts2Util.getResponse().getOutputStream(); workbook.write(out); } catch (IOException e) { e.printStackTrace(); } } }catch(Exception e){ e.printStackTrace(); } } /* * 设置标题样式 */ public HSSFCellStyle getTitleTopStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); //设置字体大小 font.setFontHeightInPoints((short)24); //字体加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //设置字体名字 font.setFontName("宋体"); //设置样式; HSSFCellStyle style = workbook.createCellStyle(); //设置底边框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //设置底边框颜色; style.setBottomBorderColor(HSSFColor.BLACK.index); //设置左边框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //设置左边框颜色; style.setLeftBorderColor(HSSFColor.BLACK.index); //设置右边框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //设置右边框颜色; style.setRightBorderColor(HSSFColor.BLACK.index); //设置顶边框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //设置顶边框颜色; style.setTopBorderColor(HSSFColor.BLACK.index); //在样式用应用设置的字体; style.setFont(font); //设置自动换行; style.setWrapText(false); //设置水平对齐的样式为居中对齐; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //设置垂直对齐的样式为居中对齐; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } /* * 列头单元格样式 */ public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); //设置字体大小 font.setFontHeightInPoints((short)11); //字体加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //设置字体名字 font.setFontName("宋体"); //设置样式; HSSFCellStyle style = workbook.createCellStyle(); //设置底边框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //设置底边框颜色; style.setBottomBorderColor(HSSFColor.BLACK.index); //设置左边框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //设置左边框颜色; style.setLeftBorderColor(HSSFColor.BLACK.index); //设置右边框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //设置右边框颜色; style.setRightBorderColor(HSSFColor.BLACK.index); //设置顶边框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //设置顶边框颜色; style.setTopBorderColor(HSSFColor.BLACK.index); //在样式用应用设置的字体; style.setFont(font); //设置自动换行; style.setWrapText(false); //设置水平对齐的样式为居中对齐; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //设置垂直对齐的样式为居中对齐; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } /* * 列数据信息单元格样式 */ public HSSFCellStyle getStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); //设置字体大小 //font.setFontHeightInPoints((short)10); //字体加粗 //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //设置字体名字 font.setFontName("宋体"); //设置样式; HSSFCellStyle style = workbook.createCellStyle(); //设置底边框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //设置底边框颜色; style.setBottomBorderColor(HSSFColor.BLACK.index); //设置左边框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //设置左边框颜色; style.setLeftBorderColor(HSSFColor.BLACK.index); //设置右边框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //设置右边框颜色; style.setRightBorderColor(HSSFColor.BLACK.index); //设置顶边框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //设置顶边框颜色; style.setTopBorderColor(HSSFColor.BLACK.index); //在样式用应用设置的字体; style.setFont(font); //设置自动换行; style.setWrapText(false); //设置水平对齐的样式为居中对齐; // style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //设置垂直对齐的样式为居中对齐; // style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } }

实现方法

/** 实现方法*/public void exportExcel() throws Exception{ String title = "测试"; String[] rowsName = new String[]{"序号","列头1","列头2","列头3","列头4","列头5"}; List<Object[]> dataList = new ArrayList<Object[]>(); Object[] objs = null; for (int i = 0; i < 10; i++) { objs = new Object[rowsName.length]; objs[0] = i; objs[1] = "测试1"; objs[2] = "测试2"; objs[3] = "测试3"; objs[4] = "测试4"; objs[5] = "测试5"; dataList.add(objs); } ExportExcelUtil ex = new ExportExcelUtil(title, rowsName, dataList); ex.export(); }

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